/*
 * Copyright (C) 2008 by Xume.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.xume.critann.annotations;

import org.xume.critann.CriteriaBuilder;
import org.xume.critann.InvalidCriteriaBeanConfigurationException;
import org.xume.critann.callback.AnnotationCallback;
import org.xume.critann.value.ParameterValue;

/**
 * $Id: MaxResultsCallback.java 26 2008-10-16 12:45:35Z johan.siebens $
 * 
 * @author Johan Siebens
 */
public class MaxResultsCallback implements AnnotationCallback<MaxResults> {

	private ParameterValue value;

	public void initialize(Class<?> criteriaBeanClass, MaxResults maxResults, ParameterValue value) {
		if (!supports(value.type())) {
			throw new InvalidCriteriaBeanConfigurationException(criteriaBeanClass, "values of type '" + value.type().getName()
					+ "' are not supported by @MaxResults");
		}
		this.value = value;
	}

	public <C, P> void doWithCriteriaBuilder(CriteriaBuilder<C, P> builder, Object criteriaBean) {
		builder.setMaxResults(intValue(criteriaBean));
	}

	public int intValue(Object criteriaBean) {
		return ((Number) value.value(criteriaBean)).intValue();
	}

	public boolean supports(Class<?> clazz) {
		return int.class.equals(clazz) || double.class.equals(clazz) || long.class.equals(clazz) || Number.class.isAssignableFrom(clazz);
	}
}
